View clinical trials related to Vitiligo.
Filter by:This project aims to develop and evaluate an online intervention to prevent and/or reduce self-stigma in German patients with visible chronic skin diseases. Evaluation of the intervention with regard to effectiveness and feasibility will follow an open-label randomized controlled design with 550 patients in total. The results of the program are expected to provide new insights and markedly extended knowledge on the mechanisms of self-stigma in chronic skin conditions. The new online intervention can be used in routine care, aiming for better patient care in practice and, ultimately decreased extent of self-stigma, increased quality of life of patients, and decreased rates of depression, anxiety, and suicide ideation.
Vitiligo is an acquired pigmentary disorder on skin and/or mucosae, which is characterized by death of melanocytes (MCs), affecting 0.5%-2% of the population worldwide (1). It doesn't affect the health of patients but it has marked social pressure and greatly interfere with their quality of life (2,3). It presents with well circumscribed milky white patches that occur secondary to destruction of melanocyte, it may appear at any age and affect both sexes equally. It can affect ethnic groups and people of all skin types with no predilection (4). Clinically, several types of vitiligo are distinguished according to the distribution of the achromic lesions. One or more lesions in a dermatomal pattern are characteristic for segmental vitiligo (SV) while this segmental distribution is absent in non-segmental vitiligo (NSV). The latter variety includes both the focal type and the generalized type (5). Numerous previous studies tried to illustrate the pathogenesis behind the disease, but the exact pathophysiology is still not fully understood. It is a multifactorial disease. Factors include, neural theory, oxidative stress theory, autoimmune hypothesis, intrinsic theory, melanocytorrhagy hypothesis (6). Many theories tried to explain the mechanisms of MC destruction in vitiligo. Apoptosis is one of the most widely studied cell death pathways. In addition, the other two forms of cell death, conventional necrosis and autophagy seem to be involved in the death of vitiligo MCs under certain situations. Moreover, new types of regulated cell death including necroptosis, pyroptosis, and ferroptosis may also participate in the pathogenesis (7). Pyroptosis is a highly inflammatory form of necrosis cell death NCD regulated mainly by caspase-1, which is initiated following large supramolecular complex ermed inflammasome activation (8). The inflammasome-activated Caspases then cleave the pyroptosis-inducing protein Gasdermin D (GSDMD), which forms a pore in the plasma membrane and causes cell lysis as well as the secretion of IL-1β typically (9). Another study suggests that inflammasome activation could be a useful marker for assessing disease progression of vitiligo (10). However, the link between vitiligo and inflammasome activation is still unclear. The inflammasome regulates cell death and inflammation via activation of caspase-1 (11). The activation of caspase-1 promotes the secretion of proinflammatory cytokines IL-1β and IL-18, as well as the initiation of pyroptosis (12). So, evaluation of pyroptosis-related indicators (GASDM-D, IL 1β & IL-18) may help understanding the obscure inflammasome pathway involvement in the pathogenesis of Vitiligo.
Introduction Vitiligo is an autoimmune disease of the skin that targets pigment producing melanocytes and results in patches of depigmentation that are visible as white spots (Frisoli et al., 2020) Vitiligo is a relatively common acquired pigmentation disorder that can cause significant psychological stress (Leung AKC et al., 2021). The disease affects both genders equally, it can appear at any age, and the average age of onset is somewhat variable in different geographic (Majumder et al, 1993), with an estimated prevalence of 0.5-2% of the population in both adults and children worldwide (Krüger et al, 2012). Vitiligo results in white macules and patches on the body. Initial lesions occur most frequently on the hands, forearms, feet, and face, favoring a periocular or perioral distribution (Ahmed jan N et al., 2023). Vitiligo lesions are classified into 2 major categories: segmental vitiligo (SV) and non-segmental vitiligo (NSV) (Relke et al ., 2019). Segmental vitiligo is characterized by its early onset, rapid stabilization, and unilateral distribution (Van Geel et al., 2017). Non-segmental vitiligo comprises of generalized (vitiligo vulgaris), acrofacial, mucosal (multifocal), and universal vitiligo (Kovacevic et al., 2016). Non-segmental vitiligo (NSV) is the most common form of vitiligo (Benzekri et al., 2013). Multiple mechanisms are involved in melanocyte disappearance, namely genetic predisposition, environmental triggers, metabolic abnormalities, impaired renewal, and altered inflammatory and immune responses (Boniface K et al ., 2018). The results of some studies indicate a frequent association of vitiligo with autoimmune diseases. A number of studies have established a higher prevalence of autoimmune endocrine diseases in women, as well as in non-segmental vitiligo patients and in cases of family history of vitiligo and/or other autoimmune diseases. In addition, it was shown that the prevalence of endocrine diseases increases with increasing area of depigmentation (Troshina EA et al., 2020). Autoimmunity in vitiligo is driven by the IFN-γ-CXCL10 cytokine signaling pathway. Activated melanocyte-specific CD8+ T cells secrete IFN-γ, which signals through the IFN-γ receptor (IFN-γR) to activate JAK1/2 and STAT1. This induces the production of CXCL9 and CXCL10, which signal through their receptor CXCR3 to recruit more auto-reactive T cells to the epidermis, resulting in widespread melanocyte destruction (Harris JE et al., 2017). The lysosomal cysteine proteinases of the papain family are involved in lysosomal bulk proteolysis, major histocompatibility complex class II-mediated antigen presentation, pro-hormone processing, and extracellular matrix remodeling.
Vitiligo is the most common depigmentation disorder affecting around 1% of the population worldwide. Fifty two percent of patients develop vitiligo before the age of 20 and around 80% develop vitiligo before the age of 30 years old.1 Vitiligo often presents in childhood and tends to be a lifelong disease, requiring prolonged courses of phototherapy. Currently no national or international registry for patients with vitiligo exists. Individual dermatologists maintain a database of such patients, however no coordinated efforts have been made to combine these individual registries into a broader national registry. Finally, recently published British Association of Dermatologists (BAD) guideline for the management of vitiligo, recommended the development of a national registry for people with vitiligo undergoing systemic or light therapy to identify outcomes and safety.
Vitiligo is characterized by the selective loss of melanocytes, which in turn leads to totally amelanotic, non-scaly, chalky-white macule with distinct margins Vitiligo is the most common depigmenting skin disorder, with an estimated prevalence of 0.5-2% of the population in both adults and children worldwide Tumor necrosis factor (TNF-α), a pro-inflammatory cytokine is necessary for Th1 mediated response and immune homeostasis and the up-regulation of TNF-α can result in chronic inflammatory and autoimmune diseases . previous studies revealed a rise in transcript and protein levels of TNF-α in vitiligo patients The prime location of melanocytes, keratinocytes and fibroblasts is the epidermal microenvironment and these cells are capable of TNF-α expression and secretion TNF-α acts as an autocrine as well as a paracrine manner to suppress the melanocyte growth and proliferation ( Tristetraprolin (TTP) zinc finger protein 36 (ZFP36) is Ribonucleic acid (RNA) binding protein that preferentially binds to Adenylate-uridylate-rich (AU-rich) regions in the 3' untranslated regions (3'UTR) of target genes . Additionally, Tristetraprolin functions by destabilizing mRNAs encoding for oncogenes, cytokines (as TNFα), and chemokines involved in the inflammatory processes, by favoring their degradation and/or preventing their efficient translation The expression of proinflammatory mediator genes is tightly controlled by post-transcriptional regulation, which is mediated by a set of immune-related RNA binding proteins, such as tristetraprolin, Roquin, and Regnase
The aim of this observational study is to evaluate the level of the IL-35 protein in tissue biopsy from patients with active & stable vitiligo.
The study aims to evaluate the safety and efficacy of the combination of topical baricitinib and 308-nm monochromatic excimer light versus 308-nm monochromatic excimer light alone in treatment of non-segmental vitiligo.
Vitiligo is a common acquired idiopathic disorder characterized by depigmentation of the skin, hair, and mucous membranes in the form of macules and patches due to selective melanocyte destruction . Incidence of Vitiligo is about 0.5% to 2% of the world's population, and its incidence continues to increase. Vitiligo can appear at any age group especially in the second and third decades of life. About one-third of vitiligo patients are children under ten years old Vitiligo can be classified into non-segmental, segmental, mixed and unclassifiable/undetermined types. Vitiligo has a negative impact on patient's quality of life by decreasing their self-confidence and causing significant psychological distress.
Insulin like growth factor has a protective role on melanocytes against the oxidative stress. The aim is to investigate this effect in vitiligo patients.
Assessing the level of circulating TCMs (cluster of differentiation (CD) 8+, CD3+,C- chemokine receptor (CCR)7, cluster of differentiation 45 receptor (CD45R) cells) in early localized vitiligo cases prior to treatment and after treatment in comparison to healthy controls. This, in turn, would provide insights regarding the role of TCMs in vitiligo and the role of early treatment in halting disease progression and autoimmune memory formation that accounts for high recurrence rate of vitiligo